Speaker
Description
During Run 3 of the Large Hadron Collider, ATLAS has operated in an unprecedented experimental environment, with record instantaneous luminosities and proton–proton collision rates pushing charged-particle reconstruction to its limits. Robust and efficient tracking is therefore a cornerstone of the ATLAS physics programme.
This contribution presents the charged-particle and primary-vertex reconstruction in the ATLAS Inner Detector, focusing on the algorithms and software configuration deployed for Run 3 data taking. The performance of the reconstruction is evaluated using Run 2 and Run 3 collision data, as well as simulated samples processed with the updated software. Excellent tracking and vertexing performance is demonstrated in high-occupancy conditions, with high reconstruction efficiency, precise parameter resolution, and a low rate of mis-reconstructed tracks sustained for up to 80 simultaneous interactions per bunch crossing.
In addition, dedicated track reconstruction passes developed to enhance sensitivity in specific physics topologies are discussed, illustrating the flexibility of the ATLAS tracking framework in addressing the diverse challenges posed by current and future LHC running conditions.
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